/Engine/Plugins/Runtime/Metasound/Source/MetasoundFrontend/Public/MetasoundFrontendController.h
Add a new output node using the output description.
On success, a valid output node handle. On failure, an invalid node handle.
[FNodeHandle](API\Plugins\MetasoundFrontend\FNodeHandle) AddOutputVertex ( const [FMetasoundFrontendClassOutput](API\Plugins\MetasoundFrontend\FMetasoundFrontendClassOutput) & InDescription )